Ronald E. Griffiths
United States Geological Survey
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Ronald E. Griffiths.
Journal of Geophysical Research | 2016
David J. Dean; David J. Topping; John C. Schmidt; Ronald E. Griffiths; Thomas A. Sabol
The Rio Grande in the Big Bend region of Texas, USA, and Chihuahua and Coahuila, Mexico, undergoes rapid geomorphic changes as a result of its large sediment supply and variable hydrology; thus, it is a useful natural laboratory to investigate the relative importance of flow strength and sediment supply in controlling alluvial channel change. We analyzed a suite of sediment transport and geomorphic data to determine the cumulative influence of different flood types on changing channel form. In this study, physically based analyses suggest that channel change in the Rio Grande is controlled by both changes in flow strength and sediment supply over different spatial and temporal scales. Channel narrowing is primarily caused by substantial deposition of sediment supplied to the Rio Grande during tributary-sourced flash floods. Tributary floods have large suspended-sediment concentrations, occur for short durations, and attenuate rapidly downstream in the Rio Grande, depositing much of their sediment in downstream reaches. Long-duration floods on the mainstem have the capacity to enlarge the Rio Grande, and these floods, released from upstream dams, can either erode or deposit sediment in the Rio Grande depending upon the antecedent in-channel sediment supply and the magnitude and duration of the flood. Geomorphic and sediment transport analyses show that the locations and rates of sand erosion and deposition during long-duration floods are most strongly controlled by spatial changes in flow strength, largely through changes in channel slope. However, spatial differences in the in-channel sediment supply regulate sediment evacuation or accumulation over time in long reaches (greater than a kilometer).
Techniques and Methods | 2012
Ronald E. Griffiths; David J. Topping; Timothy J. Andrews; Glenn E. Bennett; Thomas A. Sabol; Theodore S. Melis
..........................................................................................................................................................
Open-File Report | 2010
David J. Topping; David M. Rubin; Paul E. Grams; Ronald E. Griffiths; Thomas A. Sabol; Nicholas Voichick; Robert B. Tusso; Karen M. Vanaman; Richard R. McDonald
Geomorphology | 2008
Amy E. Draut; David M. Rubin; Jennifer L. Dierker; Helen C. Fairley; Ronald E. Griffiths; Joseph E. Hazel; Ralph E. Hunter; Keith Kohl; Lisa M. Leap; Fred L. Nials; David J. Topping; Michael Yeatts
Scientific Investigations Report | 2005
Amy E. Draut; David M. Rubin; Jennifer L. Dierker; Helen C. Fairley; Ronald E. Griffiths; Joseph E. Hazel; Ralph E. Hunter; Keith Kohl; Lisa M. Leap; Fred L. Nials; David J. Topping; Michael Yeatts
SEDHYD 2015 Conference | 2014
David J. Topping; Scott A. Wright; Ronald E. Griffiths; David J. Dean
Geomorphology | 2017
Ronald E. Griffiths; David J. Topping
SEDHYD 2015 | 2015
Ronald E. Griffiths; David J. Topping
Open-File Report | 2014
Ronald E. Griffiths; David J. Topping; Robert S. Anderson; Gregory S. Hancock; Theodore S. Melis
Journal of Geophysical Research | 2016
David J. Dean; David J. Topping; John C. Schmidt; Ronald E. Griffiths; Thomas A. Sabol